Fire pump



July 19, 1927. 1,636,382

F. NEUMANN FIRE PUMP Filed June 27, 1924 Inventor zap/4m,

Patented July 19, 1927.-

UNITED-STATES PATIENT OFFICE.

FRITZ NEUMAl NN, OF NUBE HBERG, GERMANY, ASSIGNOR T0 ARMATUREN- & MA SCHINENFABRIK A G. VORM. J. A. HILPERT OF NUREMBERG, GERMAN Y.

FIRE PUMP.

Application filed June 27, 1924, Serial No. 722,751, and in Germany June 30, 1923.

The re-cooling of the cooling water of the driving motors of'fire pumps by jacket cooling on the water delivered by the pump is known. It is further no longer new to construct jacket coolers as spiral pipe coolers with reverse water chambers.

This invention has for its object not only to improve the commonly used jacket cooling for fire engines by building the coolers like spiral pipe coolers but especially a reduction of the dimensions of the pump. This object is attained by constructing the hitherto used jacket cooling as spiral pipe cooling and by mounting it at the same time in the pump casing. Either the tie bolt-s, being hollow, or the bores of thepump casing for the accommodation of the tie bolts serve as cooling pipes of the spiral pipe cooler, the reverse water. chambers for the cooling pipes being .located, in the cover plates of. the pump.

' An embodiment of the invention is shown by 'way of example on the accompanying drawing, in which:

1 is a rear elevation.

Fig. 2 is a side elevation-partly in section. The pump casing comprises an annular chamber (1 in the front side and in the rear side, said annular chambers being subdivided by radial ribs 0 into several ring segments. The ring segments of each pump side are however displaced for half the length of the segment with'regard to the ring segments at the other pump side. The individual segments of the two annular chambers are connected with one another by axial channels arranged in the pump casing, said channels serving at the same time as passages for the tie bolts e which connectthe several parts of the pump casing'gj with oneanother, The diameter of these chariiiels is selected in such a manner that between the inner wall of the same and the tie bolts which traverse them a sufliciently large annular space is deft for the'passage of the cooling water. *The operation ofthe arrangement is as follows 1 The hot cooling water from the motor opposite annular chambers and servin enters into the ring chamber segment 01' through the tubular socket a on the rear side of the pump and flows from there through the axial channels 1 and 1 into the two ring chamber segments which correspondingly are arranged on the front cover plate of the pump. The water flows from these ring chamber segments through the axial channels 2. and 2 into the two rear water chambers (Z (i from which it flows through the axial channels 3 and 3 into the correspond-' ing front chambers. The two water currents flow then through the axial channels 4, t into the rear ring chamber at and thence, completely cooled, through a tubular socket 7) into the cooling jacket of the lower motor casing.

The cooling water travels at the cooling over a distance equal to twice, four or eightv timesthe length of the pump and it is consequently cooled in a very intensive manner. The distance over which the. cooling water travels is three to four times longer than in a standard pump. An advantage is that the outer diameter of the pump can be much shorter than in the commonly used pumps with cooling jacket.

The tie bolts 6, which connect the several partsof the pump casing with one another are tubular to serve as passages for the water.

I claim A centrifugal pump used for fire extinguishing purposes comprising in combination a pump casing constructed 'as a zigzag.

chambers into separate ring segments said pump casing having transverse channels connecting the several segments of the two as passages for the cooling water to re-coo the same, and tie bolts in said channels of. the pump casing connecting said end plates.

In testimony whereof I atlix my signature.

FRITZ I NEUMANN. 

